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What is the equation used to calculate a solution mixture of two substances with different concentrations?

  1. P1*V1 + P2*V2 = P3*V3

  2. P1 + P2 = P3

  3. P1*V1 = P3/V3

  4. V1 + V2 = V3

The correct answer is: P1*V1 + P2*V2 = P3*V3

The equation used to calculate a solution mixture of two substances with different concentrations is expressed as P1*V1 + P2*V2 = P3*V3. In this equation, P1 represents the concentration of the first substance, V1 is the volume of the first substance, P2 is the concentration of the second substance, V2 is the volume of the second substance, P3 is the concentration of the resulting mixture, and V3 is the total volume of the mixture. This relationship arises from the principle of conservation of mass and ensures that the total amount of the solute before mixing equals the total amount after mixing. When mixing solutions, you multiply the concentration of each solution by its respective volume to obtain the total amount of solute contributed by each component. This total is then equated to the concentration of the resultant mixture multiplied by its final volume, effectively creating a balance in the equation that reflects the combined effects of the two starting solutions. This approach is essential in chemistry and various applications, especially in fields like pharmacology and chemical engineering, where precise concentrations are critical for success.